Hi everyone, I experienced the first frustrating fault with my 10 month old Passat CC, yesterday, more specifically it's OEM RNS 510 unit. It developed a glitch whereby the sound muted no matter what I did. The GPS sound worked but no audio. It then worked briefly again till I pressed mute and I couldn't get any sound when I pressed it off again or tried to raise the volume again. I turned off the stereo, restarted the car etc but nothing fixed it. However after sitting in my garage overnight it seems to work ok again today. What does everyone think? Has anyone else experienced this? should I get it checked out? (it now seems to work ok)